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. 2022 Mar 20;14(3):643. doi: 10.3390/v14030643

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Genetic relationships among the HA and NA genes of EA H1N1 SIVs. (A). Phylogenetic tree of HA. The unrooted tree was based on nucleotides 33–1733. Sequences of viruses with names in black were downloaded from available databases; viruses with names in colors were sequenced in this study. (B) Phylogenetic tree of NA. The unrooted tree was based on nucleotides 21 to 1430. Scale bar indicates the number of nucleotide substitutions per site. 2009/H1N1, 2009 pandemic H1N1; EA H1N1, Eurasian avian-like H1N1; CS H1N1, classical swine H1N1; TR H1N2, triple reassortant H1N2.